/
Column.php
62 lines (55 loc) · 1.59 KB
/
Column.php
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<?php
/**
* For the full copyright and license information, please view
* the LICENSE file that was distributed with this source code.
*/
declare(strict_types=1);
namespace loophp\collection\Operation;
use Closure;
use Generator;
use Iterator;
/**
* @immutable
*
* @template TKey
* @template T
*/
final class Column extends AbstractOperation
{
/**
* @pure
*
* @return Closure(mixed): Closure(Iterator<TKey, T>): Generator<int, mixed>
*/
public function __invoke(): Closure
{
return
/**
* @param mixed $column
*
* @return Closure(Iterator<TKey, T>): Generator<int, mixed>
*/
static function ($column): Closure {
$filterCallbackBuilder =
/**
* @param mixed $column
*/
static fn ($column): Closure =>
/**
* @param T $value
* @param TKey $key
* @param Iterator<TKey, T> $iterator
*/
static fn ($value, $key, Iterator $iterator): bool => $key === $column;
/** @var Closure(Iterator<TKey, T>): Generator<int, mixed> $pipe */
$pipe = Pipe::of()(
Transpose::of(),
Filter::of()($filterCallbackBuilder($column)),
Head::of(),
Flatten::of()(1)
);
// Point free style.
return $pipe;
};
}
}